在CTime类中重载<<和>>

程序代码:

#include <iostream>

using namespace std;

class CTime//时间类
{
private:
	unsigned short int hour;    //时
	unsigned short int minute;  //分
	unsigned short int second;  //秒

public:
	CTime(int h=0,int m=0,int s=0);//构造函数
	void setTime(int h,int m,int s);//设置时间
    
    //重载>>实现输入时间
    friend istream&  operator >>(istream& input, CTime& c);

    //重载<<实现输出时间
    friend ostream&  operator <<(ostream& output, CTime& c);
	
    //比較运算符(二目)的重载
	bool operator > (CTime &t);
	bool operator < (CTime &t);
	bool operator >= (CTime &t);
	bool operator <= (CTime &t);
	bool operator == (CTime &t);
	bool operator != (CTime &t);
	
    //二目运算符的重载
	CTime operator+(CTime &c);//返回c所规定的时、分、秒后的时间。例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15
	CTime operator-(CTime &c);//对比+理解
	CTime operator+(int s);//返回s秒后的时间
	CTime operator-(int s);//返回s秒前的时间
	
    //一目运算符的重载
	CTime operator++( int);//后置++，下一秒
	CTime operator++();//前置++，下一秒，前置与后置返回值不一样
	CTime operator--( int);//后置--，前一秒
	CTime operator--();//前置--。前一秒
	
    //赋值运算符的重载     
	CTime operator+=(CTime &c);
	CTime operator-=(CTime &c);
	CTime operator+=(int s); 
	CTime operator-=(int s); 
};

//初始化时间
CTime::CTime(int h, int m, int s)
{
    hour = h;
    minute = m;
    second = s;
}

//初始化时间
void CTime::setTime(int h,int m,int s)
{
    hour = h;
    minute = m;
    second = s;
}


//重载>>实现输入时间
istream&  operator >>(istream& input, CTime& c)
{
    char ch1, ch2;//保存时和分、分和秒之间的冒号
   
    do
    {
        input>>c.hour>>ch1>>c.minute>>ch2>>c.second;

    }while(!(':' == ch1 && ':' == ch2));

    return input;
}

//重载<<实现输出时间
ostream&  operator <<(ostream& output, CTime& c)
{
     output<<c.hour<<':'<<c.minute<<':'<<c.second<<endl;

     return output;
}

//比較运算符(二目)的重载
bool CTime::operator > (CTime &t)
{
    //计算时间为多少秒
    int sec1 = hour * 3600 + minute * 60 + second;
    int sec2 = t.hour * 3600 + t.minute * 60 + t.second;

    if(sec1 > sec2)
    {
        return true;
    }
    else
    {
        return false;
    }
}

bool CTime::operator < (CTime &t)
{
    //计算时间为多少秒
    int sec1 = hour * 3600 + minute * 60 + second;
    int sec2 = t.hour * 3600 + t.minute * 60 + t.second;

    if(sec1 < sec2)
    {
        return true;
    }
    else
    {
        return false;
    }
}

bool CTime::operator >= (CTime &t)
{
     //计算时间为多少秒
    int sec1 = hour * 3600 + minute * 60 + second;
    int sec2 = t.hour * 3600 + t.minute * 60 + t.second;

    if(sec1 >= sec2)
    {
        return true;
    }
    else
    {
        return false;
    }
}

bool CTime::operator <= (CTime &t)
{
     //计算时间为多少秒
    int sec1 = hour * 3600 + minute * 60 + second;
    int sec2 = t.hour * 3600 + t.minute * 60 + t.second;

    if(sec1 <= sec2)
    {
        return true;
    }
    else
    {
        return false;
    }
}

bool CTime::operator == (CTime &t)
{
     //计算时间为多少秒
    int sec1 = hour * 3600 + minute * 60 + second;
    int sec2 = t.hour * 3600 + t.minute * 60 + t.second;

    if(sec1 == sec2)
    {
        return true;
    }
    else
    {
        return false;
    }
}

bool CTime::operator != (CTime &t)
{
     //计算时间为多少秒
    int sec1 = hour * 3600 + minute * 60 + second;
    int sec2 = t.hour * 3600 + t.minute * 60 + t.second;

    if(sec1 != sec2)
    {
        return true;
    }
    else
    {
        return false;
    }
}
//二目运算符的重载
CTime CTime::operator+(CTime &c)//返回c所规定的时、分、秒后的时间。例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15
{
    //将时间化成秒数
    int sec1 = hour * 3600 + minute * 60 + second;
    int sec2 = c.hour * 3600 + c.minute * 60 + c.second;

    //两个时间相加
    int sec3 = sec1 + sec2;

    CTime t1;

    t1.hour = sec3 / 3600;//计算时间(时)
    t1.minute = sec3 % 3600 / 60;//计算时间(分)
    t1.second = sec3 % 3600 % 60;//计算时间(秒)

    return t1;
}

CTime CTime::operator-(CTime &c)//对比+理解
{
     //将时间化成秒数
    int sec1 = hour * 3600 + minute * 60 + second;
    int sec2 = c.hour * 3600 + c.minute * 60 + c.second;

    //两个时间相减
    int sec3 = sec1 - sec2;

    CTime t1;

    t1.hour = sec3 / 3600;//计算时间(时)
    t1.minute = sec3 % 3600 / 60;//计算时间(分)
    t1.second = sec3 % 3600 % 60;//计算时间(秒)

    return t1;
}

CTime CTime::operator+(int s)//返回s秒后的时间
{
    CTime t;
    
    //将时间化成秒数
    int sec1 = hour * 3600 + minute * 60 + second;

    //计算添加s秒后的时间
    int sec2 = sec1 + s;

    t.hour = sec2 / 3600;//计算时间(时)
    t.minute = sec2 % 3600 / 60;//计算时间(分)
    t.second = sec2 % 3600 % 60;//计算时间(秒)

    return t;
}

CTime CTime::operator-(int s)//返回s秒前的时间
{
  
    CTime t;
    
    //将时间化成秒数
    int sec1 = hour * 3600 + minute * 60 + second;

    //计算降低s秒后的时间
    int sec2 = sec1 - s;

    t.hour = sec2 / 3600;//计算时间(时)
    t.minute = sec2 % 3600 / 60;//计算时间(分)
    t.second = sec2 % 3600 % 60;//计算时间(秒)

    return t;
}

//一目运算符的重载
CTime CTime::operator++( int)//后置++。如i++
{
    CTime t = *this;
    *this = *this + 1;

    return t;
}

CTime CTime::operator++()//前置++, 如++i;
{
    *this = *this + 1;

    return *this;
}

CTime CTime::operator--( int)//后置--, 如i--
{
    CTime t  = *this;
    *this = *this + 1;
    return t;
}

CTime CTime::operator--()//前置--, 如--i
{
    *this = *this - 1;
   
    return *this;
}

//两个时间相加(this是指向Time类的指针)
CTime CTime::operator+=(CTime &c)
{
    *this = *this + c;

    return *this;
}

//两个时间相减(this是指向Time类的指针)
CTime CTime::operator-=(CTime &c)
{
    *this = *this - c;

    return *this;
}

//添加s秒
CTime CTime::operator+=(int s)
{
    //将时间化成秒数
    int sec1 = hour * 3600 + minute * 60 + second;
    
    //计算添加s秒后的时间
    int sec2 = sec1 + s;

    CTime t1;

    t1.hour = sec2 / 3600;//计算时间(时)
    t1.minute = sec2 % 3600 / 60;//计算时间(分)
    t1.second = sec2 % 3600 % 60;//计算时间(秒)

    return t1;
}

//降低s秒
CTime CTime::operator-=(int s)
{
     //将时间化成秒数
    int sec1 = hour * 3600 + minute * 60 + second;
    
    //计算添加s秒后的时间
    int sec2 = sec1 - s;

    CTime t1;

    t1.hour = sec2 / 3600;//计算时间(时)
    t1.minute = sec2 % 3600 / 60;//计算时间(分)
    t1.second = sec2 % 3600 % 60;//计算时间(秒)

    return t1;
}

void main()
{
    //定义三个时间对象
	CTime t1, t2, t;

    cout<<"请输入第一个时间:";
    cin>>t1;

    cout<<"请输入第二个时间:";
    cin>>t2;

    //显示第一个时间
    cout<<"t1 = ";
	cout<<t1;
	
    //显示第二个时间
    cout<<"t2 = ";
	cout<<t2;
	
    cout<<"
以下比較两个时间大小：
";
	if (t1>t2) cout<<"t1>t2"<<endl;
	if (t1<t2) cout<<"t1<t2"<<endl;
	if (t1==t2) cout<<"t1＝t2"<<endl; 
	if (t1!=t2) cout<<"t1≠t2"<<endl;
	if (t1>=t2) cout<<"t1≥t2"<<endl;
	if (t1<=t2) cout<<"t1≤t2"<<endl;
	cout<<endl;

    //两个时间相加
    cout<<"t1 + t2 = ";
    t = t1 + t2;
    cout<<t;
    
    //两个时间相减
    cout<<"t1 - t2 = ";
    t = t1 - t2;
    cout<<t;

    //计算t1添加300秒后的时间
    cout<<"t1 + 300秒 = ";
    t = t1 + 300;
    cout<<t;

    //计算t1降低300秒后的时间
    cout<<"t1 - 300秒 = ";
    t = t1 - 300;
    cout<<t;
    cout<<endl;

    cout<<"t1 = ";
    cout<<t1;

     //计算t1++
    cout<<"t1++ = ";
    t = t1++;
    cout<<t;
    cout<<endl;

     cout<<"t1 = ";
    cout<<t1;

     //计算++t1
    cout<<"++t1 = ";
    t = ++t1;
    cout<<t;
    cout<<endl;

    cout<<"t1 = ";
    cout<<t1;

     //计算t1--
    cout<<"t1-- = ";
    t = t1--;
    cout<<t;
    cout<<endl;

     cout<<"t1 = ";
    cout<<t1;

     //计算--t1
    cout<<"--t1 = ";
    t = --t1;
    cout<<t;
    cout<<endl;

    cout<<"t2 = ";
    cout<<t2;

    cout<<"t = ";
    cout<<t;

    t2 += t;

    cout<<"运行 t2 += t1 后 t2 = ";
    cout<<t2;
    cout<<endl;

    cout<<"t2 = ";
    cout<<t2;

    cout<<"t = ";
    cout<<t;

    t2 -= t;

     cout<<"运行 t2 -= t1 后 t2 = ";
    cout<<t2;
    cout<<endl;

    system("pause");
}

运行结果: